The Sri Lankan Navy on Tuesday apprehended four fishermen, hailing from Tamil Nadu's Pudukkottai, with one boat near Delft Island.
The fishermen were taken to Kankesanthurai Naval camp in Sri Lanka for interrogation.
Earlier on October 21, the Sri Lankan Navy apprehended four fishermen and seized one boat belonging to Thangachimadam, a central part of Rameswaram.
The fishermen were apprehended near Kachadeevu Island.
Earlier in October, eight fishermen were detained by the Sri Lankan Navy, while they were fishing near the Delft Island.
The fishermen belonged to Tamil Nadu's Rameswaram.